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Could be stem seals if you park after a long drive with the engine hot. Of course it all depends upon mileage. If you are up around 180 thousand or more it is possible and a frequent problem with more than just GM engines.
The stem seals heat up and seal, if you sit after a long hot run then they shrink and let a little oil through until they warm up again. It does not sound like you have the same problem as mentioned earlier in this thread otherwise the smoke would be much worse and last much longer.
I have had several 4 cylinders and one v8 that developed intermittent stem seal leaks at 150-200 thousand miles. In all cases I changed the seals and in the case of the v8 changed a weak spring and a couple of warn rockers.
This is not major engine repair but can lead to more serious issues if left unattended causing at a minimum bad carbon build up and cat converter plug up or as my brother calls it catyleptic corn boiler congestion. ;-)
The stem seals heat up and seal, if you sit after a long hot run then they shrink and let a little oil through until they warm up again. It does not sound like you have the same problem as mentioned earlier in this thread otherwise the smoke would be much worse and last much longer.
I have had several 4 cylinders and one v8 that developed intermittent stem seal leaks at 150-200 thousand miles. In all cases I changed the seals and in the case of the v8 changed a weak spring and a couple of warn rockers.
This is not major engine repair but can lead to more serious issues if left unattended causing at a minimum bad carbon build up and cat converter plug up or as my brother calls it catyleptic corn boiler congestion. ;-)